| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM VI): Principle, Processing and Properties
|
| Presentation Title |
Superior Tensile Properties and Formability Synergy of High-Entropy Alloys Through Inverse-Gradient Structures |
| Author(s) |
Kim Rae Eon, Yeon Taek Choi, Hyoung Seop Kim |
| On-Site Speaker (Planned) |
Kim Rae Eon |
| Abstract Scope |
Heterostructuring is an emerging method for achieving an excellent combination of strength and ductility; however, its usage is often limited in the industry because of poor formability. The high mechanical incompatibility between domains in heterostructured materials facilitates crack initiation and propagation during forming. To broaden the industrial applicability of heterostructured materials, it is necessary to balance their tensile properties and formability. Herein, we propose a new strategy for designing heterostructures that are optimized for forming. Cold-rolled CoCrFeMnNi high-entropy alloy sheets were laser-treated on both sides to fabricate an inverse-gradient structure (soft outer and hard inner regions) for superior strength-ductility synergy. The resultant heterostructure induces excellent strength and ductility combination through significant HDI hardening. Furthermore, the inverse-gradient samples exhibited excellent bendability because the outer coarse-grained region prevented the generation of external cracks, and the decrease in the strength difference between neighboring domains reduced the damage evolution in severe deformation of forming. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Surface Modification and Coatings, Other |